<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>计数器</title>
    <script src="../vue.js"></script>
</head>

<body>
    <div id="root">
        <!-- 监听 -->
        <counter ref="one" @change="handleChange"></counter>
        <counter ref="two" @change="handleChange"></counter>
        <div>{{total}}</div>
    </div>
    <script>
        Vue.component('counter', {

            template: '<div @click="handleClick">{{number}}</div>',
            data: function () {
                return {
                    number: 0
                }
            },
            methods: {
                handleClick: function () {
                    this.number++;
                    this.$emit('change')
                }
            }
        })
        // 发布订阅模式
        var vm = new Vue({
            el: '#root',
            data: {
                total: 0
            },
            methods: {
                handleChange: function () {
                    this.total = this.$refs.one.number + this.$refs.two.number
                    console.log(this.$refs.one.number)
                    console.log(this.$refs.two.number)
                }
            }
        })
    </script>
</body>

</html>